A child television anti-addiction control device is installed on the back of a television

Abstract

This utility model discloses a child-friendly TV anti-addiction control device that can be installed on the back of a television, belonging to the field of smart home and child health monitoring technology. The device includes a main functional housing (1), a fixing structure disposed on the bottom surface of the housing, a control module (13), an HDMI socket (5), a power supply module (6), and an acoustic feedback module (14). The control module (13) uses an embedded processor that does not support video encoding and decoding functions and has no external volatile memory. The CEC protocol pin of the HDMI socket (5) is electrically connected to the control module (13) through a CEC interface circuit. The HDMI socket (5) is used to connect to the HDMI port of the television through an HDMI cable (11) to establish a CEC communication link between the control module (13) and the television. The TMDS data channel of the CEC communication link is unwired or the line is cut off. The power supply module (6) is electrically connected to the control module (13) and supplies power to the device. The control module (13) is electrically connected to the HDMI socket (5) and the acoustic feedback module (14) respectively, forming a control circuit that controls the TV through CEC protocol commands and drives the acoustic feedback module (14) to emit acoustic prompt signals. The main functional housing (1) is fixed to the back of the TV through a fixing structure on the bottom of the housing, and its installation thickness of 20mm after installation is configured to adapt to the narrow installation gap on the back of the TV. This utility model, through the combination of "minimalist hardware architecture", "TV back installation" and "acoustic status monitoring", adapts to the installation environment of narrow TV back, high temperature, limited power supply and limited optical conduction, so as to achieve an effective anti-tampering, stable operation and low cost child TV anti-addiction control effect.

Description

Technical Field

[0001] This utility model belongs to the field of smart home and child health monitoring technology. Specifically, it relates to a child-friendly TV anti-addiction control device that, through hardware architecture innovation and structural design, can adapt to the harsh environment of a narrow space behind a TV, high temperature, limited power supply, and limited optical conduction. Based on CEC protocol communication and acoustic feedback, it achieves "anti-tampering" by "reducing children's motivation to disassemble." This utility model is particularly suitable for installation in the narrow gap between the back of a wall-mounted TV and the wall, a space that typically has the following environmental characteristics:

[0002] 1. Limited physical space: The gap between conventional wall-mounted brackets is typically 30–50mm; however, when using ultra-thin or narrow-slit wall-mounted brackets, the gap can be reduced to 10–25mm; some "zero-distance" installation solutions that pursue the ultimate wall-hugging fit have even larger gaps. 10mm.

[0003] 2. Poor heat dissipation: Due to poor air circulation, the components on the back of the TV generate a lot of heat, and the surface temperature of the heat source areas (such as the power supply and main chip heat sink) can reach over 60°C in high summer conditions. Heat accumulates in the enclosed space and spreads to the surroundings, causing the local ambient temperature to reach 50–55°C even in areas not directly exposed to heat sources.

[0004] 3. The TV's USB port has stringent power supply requirements: This port is a non-ideal power source, and its power supply capability is subject to dual constraints:

[0005] a. Large voltage fluctuations: Its output voltage fluctuates significantly depending on the TV's operating state (especially during remote power-on / off, backlight adjustment, and power-on transitions). Due to factors such as cable voltage drop, port internal resistance, and load transient response, its actual output voltage range can be as low as 4.0V and as high as 5.5V, far exceeding the range specified by the USB standard (4.75V-5.25V).

[0006] b. Limited and potentially restricted current output capability: This port not only has a limited current output capability (usually...) 500mA), and more seriously, in order to control system power consumption and cost (especially to meet strict standby power consumption regulations), some TV manufacturers will set lower output current limits at the hardware or software level (usually 100mA-300mA, and in low power consumption modes such as standby, the current limit can be as low as 100mA), and trigger protective power-off or cause the output voltage to drop sharply when the load exceeds the limit.

[0007] The harshness of the aforementioned power supply environment places high demands on the power management circuits (efficiency, voltage drop, static power consumption) of devices that rely on it for power, as well as their own maximum power consumption.

[0008] 4. Limited optical transmission: The device is hidden behind the TV, which causes the traditional visual status indicators (such as LED lights or OLED screens) installed on the device to lose their indication function, and the infrared control that relies on optical transmission to fail. Background Technology

[0009] The following are some of the core issues that urgently need to be addressed in the current management of home television use:

[0010] 1. Health risks: Prolonged television viewing has become one of the main risk factors affecting the vision health of teenagers.

[0011] 2. Behavioral and cognitive effects: Unrestrained television viewing can easily lead to children's inattention and decreased learning efficiency.

[0012] 3. Regulatory Gap and Anti-Tampering Challenges: During periods when parents cannot directly supervise, children's television viewing time can easily spiral out of control. Even more challenging is that existing devices, due to limitations in size, power consumption, or installation methods, are easily discovered and physically dismantled by children, rendering the control functions ineffective. Therefore, the device's ability to prevent discovery and dismantling has become a decisive factor in the effectiveness of technological solutions in this field.

[0013] In existing technologies, the software control schemes built into televisions have blind spots due to system permission restrictions, which has spurred the development of external hardware solutions. For external hardware, the most intuitive approach is to enhance the device's resistance to vandalism through mechanical reinforcement (such as using a metal casing, adding locking structures, etc., as in patent document CN202259875U). However, for child users in the home environment, such "reinforcement" methods have limited effectiveness. Visible devices easily arouse children's curiosity and exploratory desires, especially when their viewing behavior is restricted, making them more likely to become clear targets for destruction. Mechanical reinforcement mainly increases the physical difficulty of destruction, but has limited effect on eliminating or reducing the motivation for destruction. Furthermore, complex reinforcement structures increase the size, weight, and cost of the device, affecting the aesthetics of home appliances.

[0014] Therefore, from the perspective of human factors engineering and psychology, a better anti-interference strategy may not be simply "strengthening the resistance," but rather focusing on "eliminating the motivation." This means increasing the difficulty of unauthorized disassembly and reducing the benefits of disassembly, thereby reducing the user's motivation to disassemble, achieving a comprehensive effect of being "difficult to detect, difficult to disassemble, and pointless to disassemble." The environment behind a television, due to its blind spot, high installation height (difficult to reach), and inconvenient operation, provides an ideal natural advantage for implementing this strategy. Furthermore, the act of installing the device on the back of the television itself constructs a "behavioral responsibility definition" mechanism. This location is beyond the scope of everyday unconscious touch; any operation of the device can usually be considered a conscious and purposeful act. This makes any cable detachment or physical damage to the device highly suspicious of intentional sabotage, thus creating a strong psychological deterrent for child users and effectively reducing their motivation to attempt disassembly.

[0015] However, existing peripheral device solutions generally have the following technical limitations in systematically utilizing the aforementioned psychological and physical advantages of "mounting on the back of the TV":

[0016] 1. Physical power-off solution (e.g., patent document CN202259875U): This type of solution typically uses a lockable enclosure to enclose the timer socket, restricting operation of the socket. However, this solution faces the following challenges in practice:

[0017] a. Regarding television stability: It uses a direct power-off method, which is not part of the standard television shutdown procedure. Frequent hard power-off operations affect the long-term operational stability of the television.

[0018] b. In terms of user experience: After a power outage, the TV needs to undergo a complete cold start when it is powered on again, and it takes a long time to go from being turned on to being viewable.

[0019] c. Regarding installation: Due to the inclusion of relays, sockets, and locks, the overall size of the device is usually large, making it inconvenient to install in space-constrained areas such as behind a television. Furthermore, as a standalone unit, it connects to a wall power source via a plug; this non-fixed connection means the device can be removed from the power supply, affecting the reliability of the control effect.

[0020] 2. Infrared remote control solution (such as patent document CN205961343U): Its infrared transmitter needs to be aligned with the infrared receiving window of the TV, which technically requires the device to be placed in a prominent position in front of or to the side of the TV, which conflicts with the requirement of "installation on the back of the TV".

[0021] 3. CEC protocol control scheme (e.g., patent document AU2023271383A1): This scheme represents a more advanced approach to non-physical power-off control and does not require infrared alignment. However, its technical approach relies on "generating and overlaying video information" to achieve human-computer interaction. It is worth noting that the complex architecture upon which this type of scheme relies (high-performance application processor AP, external DRAM, video codec) has the following unresolved issues, making it difficult to apply to the harsh environment behind a television:

[0022] a. Incompatibility with spatial and physical characteristics: its high power consumption (typically) The 3W characteristic conflicts with the limited power supply capability of the aforementioned TV USB port, necessitating active cooling measures (such as heat sinks or miniature fans) to control the chip junction temperature. Such cooling modules directly increase the size and thickness of the device, making it difficult to embed the device into the back gap of mainstream TVs.

[0023] b. Incompatible power supply characteristics: Active cooling components (especially fans) also consume additional power, which further exacerbates the already strained power supply of the TV's USB ports, easily triggering the port's overcurrent protection (which is typically limited to 100mA-300mA), leading to system-level instability. An independent external power supply is required, and the exposed cables are easily detached.

[0024] c. Incompatibility between environment and reliability: The back of the TV is a closed thermal environment without air cooling. Active cooling measures can only accelerate the thermal circulation inside the device, but it is difficult to effectively dissipate heat to the external environment, resulting in limited cooling effect. According to the Arrhenius model, the junction temperature of components in this environment will rise exponentially, leading to a sharp drop in device reliability, shortened lifespan, and frequent triggering of overheat protection or system crashes, making it difficult to meet the requirements for long-term stable operation of home appliances.

[0025] d. Response latency impacts user experience: Solutions based on advanced operating systems such as Linux typically have long cold start times. A 15-second response time is insufficient to meet users' expectations for a fast TV response, especially in scenarios where power is interrupted and then restored, impacting the user experience.

[0026] e. Incompatibility between productization and commercialization: Introducing active cooling will increase the material cost of the device, operating noise, and introduce new mechanical failure points, making it difficult to meet the requirements of home consumer electronics products for low cost, high quietness, and high reliability.

[0027] Furthermore, even when attempting to implement video overlay functionality using relatively low-power chips (such as the ESP32-S3), this improvement approach still faces insurmountable obstacles:

[0028] a. Instantaneous peak current exceeds limit: The peak current requirement at the moment of video encoding startup (usually...) The current rating of 400mA exceeds the current limit of most TV USB ports, easily triggering the port's overcurrent protection or causing the output voltage to drop, resulting in continuous device restarts and unstable operation. To ensure operation, an independent power supply is still required, leading to the problem of easily exposed cables.

[0029] b. Cumulative thermal failure risk: In a high-temperature, enclosed environment, even heat generated by brief video operations is difficult to dissipate. The cumulative heat effect from repeated operations still poses a long-term risk of chip thermal breakdown, making reliability difficult to guarantee.

[0030] c. Architecture complexity and cost disadvantages: In order to realize the video function, an external memory is still required and a complex software stack is introduced, which increases the system complexity, material cost and potential failure points, making it difficult to achieve the extremely simple and low-cost architecture of this utility model.

[0031] Remote control bridging solutions (such as CN217880541U): This solution aims to solve the problem of "one remote control controlling multiple devices," by receiving commands through a wireless module and converting them into CEC signals for forwarding. However, this technical approach differs from the "anti-addiction" and "anti-tampering" objectives of this utility model:

[0032] a. Differences in functional positioning: Its core is "passive command forwarding". To achieve this function, an infrared receiving module needs to be integrated. This module needs to be "optically aligned" with the remote control. Technically, this requires the device to be placed in a prominent position in front of or to the side of the TV, which is not suitable for "installation on the back of the TV".

[0033] b. No feedback mechanism required: Its design focuses on command forwarding and does not require optimization for status feedback in the case of installation on the back of the TV.

[0034] c. The architecture does not need to be extremely simplified: Since its function is only instruction forwarding, there are no extremely demanding requirements for power consumption, heat generation, and size. Therefore, its hardware architecture does not need to have extremely simple features such as "no external DRAM", "no support for video encoding and decoding", "ultra-low power consumption" and "small thickness".

[0035] Therefore, this solution is insufficient to address the specific problem of "reliable anti-addiction control in a TV-mounted environment".

[0036] Furthermore, television installation methods are trending towards flush mounting against the wall, with "zero-distance" or "narrow-gap" mounting solutions (e.g., see patent document CN119267756A) becoming increasingly common, reducing the installation gap from the conventional 30-50mm to 10-25mm. This structural evolution places stricter physical constraints on functional devices mounted on the back of the television: the thickness of these devices needs to be reduced (typically requiring a certain thickness for installation). (20mm) to be compatible with TVs of different brands, models and sizes.

[0037] However, existing CEC control schemes (such as patent document AU2023271383A1) generally employ complex architectures relying on video overlay in pursuit of rich interactive experiences. While this approach solves the interaction problem, its inherent high power consumption, high heat generation, and large size create an irreconcilable contradiction with the harsh physical environment of the narrow, high-temperature, and power-limited space behind a television. This makes it difficult for improved schemes based on this approach to simultaneously achieve reliable control while meeting the requirements for small thickness, low power consumption, and low heat dissipation for installation on the back of a television. Therefore, the core technical problem to be solved by this invention is to provide a device that can achieve reliable anti-addiction control, reduce the incentive to disassemble it through structural design, and operate stably for a long time in the narrow, enclosed space behind a television. Summary of the Invention

[0038] Technical solution

[0039] The purpose of this utility model is to provide a child television addiction prevention control device, which adapts to the harsh environment behind the television to achieve effective tamper prevention, stable operation, and low cost. To achieve the above objective, the technical solution of this utility model consists of three mutually cooperating components:

[0040] 1. A “minimalist hardware architecture” designed to adapt to the physical environment of a TV, characterized by a narrow back, high temperature, limited power supply, and difficulty in infrared alignment, while achieving low-power operation;

[0041] 2. A “rear-mounted” device for utilizing the visual and tactile blind spots on the back of a television to increase the physical difficulty of unauthorized disassembly;

[0042] 3. An "acoustic status monitoring" system is used to solve the problem of visual indication failure caused by concealed installation, and a status monitoring and warning mechanism is constructed through acoustic feedback.

[0043] The aforementioned "minimalist hardware architecture," "rear-mounted TV," and "acoustic status monitoring" support each other, together forming a complete technical solution that achieves effective tamper resistance, stable operation, and low cost. Specifically:

[0044] 1. The "minimalist hardware architecture" includes:

[0045] a. A control module (13), which is an embedded processor, with a total on-chip volatile memory capacity of... With only 1MB of memory and no external DRAM, its hardware dictates that it does not support video encoding and decoding operations.

[0046] b. An HDMI socket (5) whose TMDS data channel is physically empty or unconnected, with only the CEC protocol channel electrically connected to the designated GPIO pin of the control module (13);

[0047] c. An acoustic feedback module (14) is electrically connected to the control module (13).

[0048] This architecture achieves low power consumption and a small thickness by eliminating video functionality and external memory, providing a foundation for rear-mounting in televisions.

[0049] 2. The “TV rear mounting” includes a fixing structure disposed on the bottom surface of the main functional housing (1), the mounting structure being configured to fix the device to the back of the TV, and includes the following features:

[0050] a. Communication uses the CEC protocol, eliminating the need for optical alignment;

[0051] b. The installation thickness of the main functional housing (1) after installation via the fixing structure. 20mm (preferred installation thickness) 15mm, preferably an installation thickness 10mm);

[0052] c. Power is supplied from the TV's USB port, and the cable runs along the seam on the back of the TV.

[0053] d. The cable interface is equipped with a fixing structure to prevent unauthorized removal;

[0054] e. The installation location is in the upper third of the back of the TV.

[0055] This installation method utilizes environmental characteristics to increase the difficulty of unauthorized disassembly.

[0056] 3. The “acoustic status monitoring” is implemented through the acoustic feedback module (14), which is configured as follows:

[0057] a. A lower-pitched sound An active buzzer with 65dB(A)@1m;

[0058] b. Driven by the control module (13), it issues a continuous prompt signal within 1-3 seconds after the TV is detected to be powered on;

[0059] c. Establish a correlation between the device's operating status and acoustic signals, so that device failure caused by disassembly will be exposed through the loss of acoustic signals.

[0060] This mechanism compensates for the failure of visual indicators and improves the reliability of tamper protection through acoustic monitoring.

[0061] Beneficial effects

[0062] Compared with the prior art, the present invention, through the above technical solution, can produce the following beneficial effects:

[0063] 1. Improved reliability of device anti-tampering

[0064] a. Increased difficulty of physical disassembly

[0065] i. Reduced visual detectability:

[0066] 1. Viewpoint Obstruction: The device is installed on the back of the television and is difficult to observe directly from the front and sides of the television from conventional viewing angles. Its visibility depends on the specific alignment of the observer's line of sight with the gap on the back of the television.

[0067] 2. Concealment from a Gap View: Taking a mainstream 55-inch TV as an example, the gap between the wall-mounted installation and the wall is typically 20mm-50mm. The device uses a color similar to the TV casing, and its maximum installation thickness... 20m. Within this narrow gap, the visible area of ​​the device is small, and its line of sight is easily obstructed by the cable bundle attached to the television, thus reducing the probability of accidentally discovering the device from outside the gap.

[0068] ii. Limitations on operational accessibility and operability:

[0069] 1. Accessibility Restrictions: The device is installed on the back of the television, requiring the user to navigate around the top or sides of the TV. For example, with a 55-inch TV wall-mounted at a height of 1.2m (center of the TV from the ground), the top of the TV can be approximately 1.5m from the ground. This height exceeds the unassisted direct operating range of children aged 6-12 (average height 1.2m-1.5m), typically requiring the operator to tiptoe or use tools to reach the back of the TV, increasing the difficulty of operation and the likelihood of being noticed.

[0070] 2. Operational Limitations: The operating gap between the device and the wall is typically 10mm-20mm. According to Chinese anthropometric standards for minors, the finger thickness of children aged 6-12 years is approximately 8mm-12mm, while the forearm thickness can reach 40mm-80mm. This gap usually only allows the fingertips to fit, making it difficult to perform effective pinching, force application, or disassembly actions. Blind operation in such a narrow gap, where direct vision is difficult, presents a high level of complexity.

[0071] b. Monitor device status via sound feedback: sound pressure level An acoustic cue signal of 65 dB(A) at 1 m can be perceived under typical household background noise (approximately 35 dB(A) - 45 dB(A)). The established correlation between the device's operational status and the acoustic signal allows the device's inoperable state (such as failure due to disassembly) to be identified by the absence of the acoustic signal.

[0072] c. Enhancing tamper resistance reliability through functional synergy: The concealment of the physical structure reduces the probability of device interference; the monitoring of the acoustic status provides a means of identifying whether the device has been interfered with. The combination of the two forms a dual guarantee for the integrity of the device.

[0073] 2. Improved compatibility with the environment behind the TV

[0074] a. Thermal compatibility: Total power consumption of the device when operating at full load. Its low power consumption of 0.5W allows it to maintain a low junction temperature within an ambient temperature range of 50°C-55°C. 85 Within the safe operating range of C, it can operate reliably for a long time without the need for active heat dissipation. The power consumption limit of 0.5W makes the device suitable for harsh power supply conditions (4.5V). It can still meet the heat dissipation requirements of the high-temperature environment on the back of the TV at 100mA.

[0075] b. Power supply compatibility: The operating current of the device is typically lower than... This value is based on the common lower limit setting of the TV USB port overcurrent protection threshold, which allows it to adapt to the output voltage fluctuations of the port (4.5V to 5.5V) and supports a simplified power supply scheme that draws power directly from the TV USB port.

[0076] c. Space compatibility: Minimal thickness of the device (installation thickness) (20mm) This allows it to be installed in the gap between most mainstream wall-mounted TVs and the wall.

[0077] d. Timely response: Based on its software architecture, the device has a short cold start time (usually less than 3 seconds), which helps to issue acoustic prompts and execute commands in a short time after detecting changes in the television status.

[0078] 3. Reduction in equipment complexity and cost

[0079] a. Material cost: The hardware architecture does not use video codec units, external DRAM memory, and high-performance application processors, thus reducing the use of high-cost components.

[0080] b. Production costs: Reducing the total number of components helps to reduce the complexity of circuit board assembly, which has a positive impact on improving production yield.

[0081] 4. Functional Support Among Technical Features: The low power consumption and small thickness characteristics provided by the "minimalist hardware architecture" enable "rear-mounted TV" installation; the concealment brought about by "rear-mounted TV" creates a need for a non-visual status feedback mechanism (i.e., "acoustic status monitoring"); "acoustic status monitoring" is used to solve the status monitoring problem under concealed installation. The three are interconnected and work together to serve the intended functions of the device in the target environment.

[0082] Functional flow of the device

[0083] The device of this utility model achieves the following functional flow through the coordinated operation of its hardware units:

[0084] 1. Hardware connection and installation: The device is connected to the HDMI port of the TV through its HDMI socket (5) and HDMI cable (11), obtains power supply through its power supply module (6) connected to the USB port of the TV, and is fixed to a suitable position on the back of the TV through its fixing structure.

[0085] 2. Communication function configuration (optional): The device supports wireless connection with external mobile terminal devices (such as mobile phones) via its wireless communication module (15) to receive configuration parameters or firmware updates.

[0086] 3. Core control and anti-tampering mechanisms:

[0087] a. Status monitoring: The control module (13) continuously monitors the power on / off status of the TV via the HDMI socket (5);

[0088] b. Rule execution: Based on preset or remotely issued control rules, the control module (13) sends corresponding CEC protocol control commands (such as power off commands) to the TV through the HDMI socket (5) when the TV is turned on and when the usage time limit is reached.

[0089] c. Acoustic feedback and local anti-tampering: When the TV status changes (e.g., power on) or a rule is triggered (e.g., timeout shutdown), the control module (13) drives the acoustic feedback module (14) to issue a corresponding acoustic prompt signal. The acoustic prompt mechanism constructs a "status-feedback" correlation model, so that any abnormal state of the device (e.g., power outage, disassembly) will result in the loss of the expected acoustic signal, thereby prompting parents to intervene.

[0090] d. Remote Status Monitoring (Optional): When the device is configured and connected to the network, the control module (13) can be configured to periodically send heartbeat signals to a remote server. Parents' mobile terminals can remotely monitor the online status of the device by querying the server's heartbeat status. If the server does not receive a heartbeat for a long time, it can send an alarm to the parents to detect a device malfunction, thereby achieving remote tamper-proof monitoring.

[0091] Depending on whether or not an internet connection is available, the above functions can be combined into two typical working modes:

[0092] 1. Offline Autonomous Mode (Core Mode): In this mode, the device does not require an internet connection. The control module (13) can operate independently based on the control rules (such as single-use duration) pre-installed in its non-volatile memory and the time reference provided by the clock management unit built into the control module (13). It monitors the TV status through the HDMI socket (5) and sends CEC protocol commands to complete the TV anti-addiction control function. At the same time, its acoustic feedback and anti-tamper monitoring loop also operate independently, without relying on an external network. This mode ensures that the core anti-addiction and anti-tamper functions of the device remain fully available even in environments without a network or when the user does not configure a network.

[0093] 2. Online Linkage Mode (Preferred Mode): In this mode, the device may also include a wireless communication module (15). The wireless communication module (15) is electrically connected to the control module (13) and is used to connect to external mobile terminals and Internet services. Building upon all the functions of the offline mode, it enables more accurate time synchronization, more flexible policy configuration (such as remotely issuing new rules), and enhanced experiences such as remote status monitoring and alarms. Attached Figure Description

[0094] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0095] Figure 1 : Perspective view of the appearance of this utility model.

[0096] Figure 2 : Cross-sectional structural diagram of this utility model.

[0097] Figure 3 : Structural module connection diagram of this utility model.

[0098] Figure 4 : Installation diagram of this utility model.

[0099] Figure 5 : Circuit diagram of the CEC interface circuit of this utility model.

[0100] Figure 6 : Schematic diagram of the installation thickness measurement of this utility model.

[0101] Explanation of markings in the diagram

[0102] Main functional housing (1), acoustic conduction structure (2), LED light (3), button (4), HDMI socket (5), power supply module (6), heat dissipation structure (7), housing bottom mounting structure (8), detachable base (9), HDMI plug (10), HDMI cable (11), control circuit board assembly (12), control module (13), acoustic feedback module (14), wireless communication module (15), TV (16).

[0103] Special Notes Regarding the Attached Drawings

[0104] The inventive point of this utility model lies in the architectural innovation of the hardware modules, the functional synergy between the modules, and the resulting technical effects, rather than the specific circuit implementation methods within each module or their interconnection. The electrical connection between the control module (13) and the acoustic feedback module (14), the CEC interface circuit (the electrical connection between the control module (13) and the HDMI socket (5), etc., are all common circuits or conventional designs known in the art. The implementation methods of these specific circuits are easy for those skilled in the art to know and implement, or can be implemented through conventional design based on the datasheet of the selected chip. Therefore, the accompanying drawings focus on showing the hardware architecture and physical structure that embodies the inventive point of this utility model. The drawings do not provide all the specific circuit schematics of each module and their interconnection (only the connection circuit diagram of the CEC interface circuit is given as an example, such as...). Figure 5 Based on the architectural relationships, functional requirements, and common knowledge disclosed in this utility model, those skilled in the art can reasonably select and implement the specific circuit connections between the modules without creative effort. Figures 1-2 The above is a basic implementation of the main functional housing (1). It can be understood that its shape can also adopt other forms that are conducive to the installation of the back of the TV, such as the slope structure described in the specific implementation of the specification. Figure 3 The block diagram shown is used to clearly illustrate the connection relationships between the various functional modules; Figure 4 The image shows a suggested installation location example. Users can adjust it appropriately according to the actual situation of their TV. Figure 6 The diagram shown illustrates the measurement of the device's mounting thickness. The HDMI cable direction is non-directional; please refer to the specific wiring instructions. Figure 4All circuit implementation schemes based on the same architectural concept and capable of achieving the same function as this utility model are reasonable extensions and equivalent substitutions of the technical solution of this utility model and should fall within the protection scope of this utility model. Detailed Implementation

[0105] Related definitions

[0106] 1. The "total power consumption during full-load operation" described in this utility model "0.5W" refers to the measured value under the following benchmark test conditions:

[0107] a. Test status: The device is in a normal room temperature environment, the wireless communication module (15) is in a closed or non-working state, and the control module (13) continuously runs a computationally intensive benchmark test program (such as Dhrystone) to keep its CPU load rate above 98%.

[0108] b. Measurement point: The measurement is performed at the input terminal of the power supply module (6);

[0109] c. Measuring tools: Use a high-precision power meter or current / voltage probe, sampling time... Take the average value over 30 seconds.

[0110] 2. In this utility model, the "installation thickness" refers to the maximum distance between the most protruding point of the outer surface of the main functional housing (1) (excluding the protruding parts of functional interfaces or operating components such as LED lights (3), buttons (4), HDMI sockets (5), and power supply modules (6)) and the surface of the back of the television (16) in a direction perpendicular to the back of the television (16) after the device is fixed to the back of the television (16) by the fixing structure. The measurement method is as follows: Figure 6 As shown. The "installation thickness" 20mm, "Installation thickness" 15mm, "Installation Thickness" The “10mm” is based on this measurement definition. The television (16) here is only an example of the mounting surface of the device. It can be understood that this mounting surface can also be a wall.

[0111] 3. In this utility model, the sound pressure level of the acoustic prompt signal is " "65dB(A)@1m" refers to the A-weighted sound pressure level measured at a distance of 1 meter directly in front of the acoustic conduction structure (2) in a free-field environment with background noise below 30dB(A) using a Class 1 sound level meter conforming to IEC 61672. The value of this sound pressure level is not less than 65 dB. This sound pressure level is selected so that it can effectively cover the background noise of a typical home environment and be clearly perceived.

[0112] 4. In this utility model, the “on-chip volatile memory capacity” specifically refers to the total capacity of the static random access memory (SRAM) integrated inside the embedded processor (control module (13)) chip wafer, and the measurement method is to read the SRAM capacity parameters marked in the processor chip datasheet.

[0113] Basis for selecting key technical parameters

[0114] The key technical parameters involved in this utility model have been designed and verified, and their selection is based on the response to the environmental constraints and functional requirements of the TV's rear mounting. The specific basis is as follows:

[0115] 1. Thickness parameter: The "installation thickness" of the device "20mm" and its preferred value "installation thickness" 15mm, "Installation Thickness" The determination of "10mm" is based on the following two aspects:

[0116] a. Physical compatibility requirements: Based on actual measurement data of the gap between mainstream wall-mounted TVs and the wall, the thickness parameter is designed to enable the device to adapt to the vast majority of target installation environments.

[0117] b. Visual concealment requirement: Based on research on visual perception, the visible side area of ​​the device under this thickness parameter (e.g., approximately 800mm²) 2 The thickness is controlled at a level that is unlikely to attract unintentional attention. Furthermore, the main functional housing (1) of the device can also adopt a sloping streamlined structure, which can further reduce its visibility within the aforementioned thickness limitations.

[0118] This parameter range forms the physical basis for achieving "rear-mounted TVs" and utilizing their visual concealment. The upper limit (20mm) ensures compatibility with conventional installation gaps; the preferred value (15mm) is for ultra-thin wall-mounting needs; and the optimal value (10mm) is geared towards the trend of "zero-distance" wall mounting.

[0119] 2. Volatile memory capacity parameters:

[0120] a. Architectural differentiation and technological boundaries (regarding "total capacity of on-chip volatile memory") 1MB): This utility model limits the on-chip SRAM capacity of the control module (13) to "the total capacity of the on-chip volatile memory". 1MB. This value was determined based on the engineering consensus on the minimum memory resources required for embedded systems to implement video overlay functionality.

[0121] i. Minimum memory requirements for video functionality: A frame buffer needs to be allocated to output image information that is basically readable on a TV (e.g., 480p resolution, RGB565 format). The formula for calculating its capacity is as follows:

[0122]

[0123] in, (Horizontal pixels) (Vertical pixels) (Bytes / pixel). Calculated as follows:

[0124]

[0125] ii. Minimum system memory requirements: Running the video overlay function also requires memory overhead from the operating system kernel, graphics library, application logic, etc., typically not less than 300KB. Therefore, the total memory requirement ( The theoretical lower bound is:

[0126]

[0127] In practice, the required capacity typically exceeds 1MB. Therefore, the on-chip volatile memory capacity is limited to [specific value]. The 1MB size ruled out the feasibility of implementing video overlay functionality from a hardware architecture perspective, leading to a minimalist architecture design to meet the requirements of low power consumption and small thickness for installation environments.

[0128] b. Determining the preferred range (for the total capacity of on-chip volatile memory) (512kb): The memory footprint required to run the core firmware of this invention is estimated to be no more than 150KB. The on-chip SRAM capacity is further limited to... With 512KB, it meets all functional requirements and provides redundancy, and is a preferred choice among mainstream low-cost IoT microcontroller unit models on the market. This helps control material costs, and the smaller capacity SRAM typically has lower static power consumption, making it suitable for environments where power supply is limited by the TV's USB port.

[0129] 3. Current Parameters: The power supply module's "maximum operating current of 500mA" is set according to the standard power supply specifications (5V / 500mA) of the USB 2.0 port. This value is intended to ensure that when the device draws power from the TV's USB port, its current requirement is within the range generally supported by the port, avoiding protective power-off or voltage instability caused by the load current exceeding the port's design capacity.

[0130] 4. Power consumption parameters: This utility model defines the total power consumption of the device during full-load operation. 0.5W" is set as The 0.5W power rating is designed to be compatible with the power supply characteristics of the TV's USB port.

[0131] a. Power supply environment analysis: The TV USB port has output voltage fluctuations (as low as 4.0V) and often has an output current limit (as low as 100mA).

[0132] b. Power consumption boundary calculation: Under extreme power supply conditions (voltage 4.0V, current limit 100mA), the maximum power that the port can provide is 4.0V0.1A=0.4W.

[0133] c. Design Goals: Set the device power consumption target as follows: The 0.5W power consumption target is designed to ensure stable operation on most TV USB ports, avoiding overcurrent protection triggering due to excessive power consumption. This power consumption target dictates a simplified hardware architecture and allows for natural heat dissipation to manage the device's thermal performance in the high-temperature environment behind the TV.

[0134] 5. Other component parameters: The current-limiting resistor parameters used in the device are selected based on the typical application circuit of the selected chip and the standard electrical specifications of the HDMI-CEC protocol. These are conventional design choices for those skilled in the art and require no creative effort. Detailed Implementation

[0136] Basic Implementation

[0137] This embodiment uses a specific, feasible structure as an example to illustrate the technical solution of this utility model. In this embodiment, the thickness of the device after installation is 20mm (i.e., the installation thickness). (20mm), this solution is compatible with the back gap of most mainstream wall-mounted TVs, clearly showing the various components of this utility model and their connection relationship.

[0138] Shell structure and mounting structure

[0139] 1. Main functional housing (1):

[0140] a. The material is ABS or PLA, with a wall thickness of approximately 2.0mm. The surface is matte to reduce reflection, enhance the installation on the back of the TV, and minimize the loss of WI-FI signal penetration.

[0141] b. External dimensions are 50mm × 40mm × 18mm (e.g.) Figure 1-2 As shown), its shape is a rectangular shell. The shell is installed via a fixed structure (including a detachable base (9)), and the installed thickness is 20mm. It is understood that its shape can also adopt other forms that are conducive to the rear mounting of the TV, such as a streamlined sloping structure (not shown in the figure).

[0142] c. It is understandable that by optimizing the layout and selection of internal components (e.g., using a lower-profile surface-mount buzzer instead of the pin-type buzzer shown in the diagram, or using a thinner main control module), the housing thickness can be further reduced, thus achieving a lower mounting thickness. 15mm (15mm) or even installation thickness A better option is 10mm (10mm) to accommodate ultra-thin wall mounting and "zero-distance" wall-mounting requirements. Figure 1 , Figure 2 The structure shown is a basic implementation method that clearly demonstrates the internal components.

[0143] d. The HDMI socket (5) adopts a standard HDMI-A type female connector (such as... Figure 1-2 As shown, it is located on the side of the housing to ensure compatibility with standard HDMI cables. It is understood that a microHDMI interface (not shown in the figure) could also be used to further reduce thickness.

[0144] e. The power supply module (6) adopts a Type-C interface and is also located on the side of the housing, drawing power from the TV's USB port;

[0145] f. The heat dissipation structure (7) adopts a grid heat dissipation hole design, which is aligned with the heat source area where the control module (13) is located, in order to optimize heat dissipation;

[0146] g. The outer surface color matches the color of the TV's back cover, preferably dark gray or black, further reducing visual visibility.

[0147] 2. Fixed structure

[0148] a. Detachable design (e.g.) Figure 1 The bottom mounting structure (8) of the housing and the detachable base (9) are detachably installed by Velcro, which facilitates maintenance and position adjustment.

[0149] b. Direct fixing scheme (not shown in the figure): The surface of the mounting structure (8) on the bottom of the housing is provided with a high viscosity pressure-sensitive adhesive layer, which can be directly adhered to the back of the TV;

[0150] c. The preferred installation location is near the center line of the back of the TV (e.g., Figure 4 The upper third of the screen. This area is usually obscured by wall mounts and cable bundles, and its installation height (from the top of the TV frame) is... The 20cm (20cm) size is beyond the reach of a child's bare hands, increasing the difficulty of unauthorized disassembly in terms of both physical space and operational accessibility.

[0151] 3. Cable fixing and wiring installation on the back of the TV:

[0152] a. Interface locking solution: Uses HDMI / USB anti-disengagement clips, which require a screwdriver to tighten and are difficult to disassemble by hand;

[0153] b. Cable securing solution: Use nylon cable ties or Velcro cable ties to secure the cables tightly to the TV back panel, with the cable routing path following the existing cable bundles or bezel gaps of the TV.

[0154] c. Housing integration solution: The housing is designed with a cable interface compartment, and the compartment cover is locked with Torx screws, requiring a special tool to open;

[0155] d. All external cables are made of a dark gray or black color similar to the back of the TV to further reduce visibility.

[0156] Circuit board structure and functional connection

[0157] The control circuit board assembly (12) (taking the ESP32-C3 core development board as an example, such as...) Figure 2 The control module (13) and its peripheral circuits are integrated (as shown). Its hardware architecture and functional connection relationship (e.g.) Figure 3 As shown below:

[0158] 1. Core Hardware Architecture:

[0159] a. Processor architecture: A 32-bit RISC-V single-core processor is used as the control module (13), with a main frequency of 160MHz. Its instruction set does not support video encoding and decoding functions.

[0160] b. Storage architecture: The control module (13) integrates 400KB of SRAM on-chip (to meet the total capacity of the on-chip volatile memory). 1MB requirement, and must meet the total capacity of on-chip volatile memory. With a preferred range of 512kb and 4MB of SPI Flash as non-volatile memory, and without any external DRAM memory, the video function is eliminated from the hardware architecture, achieving a minimalist architecture.

[0161] c. Communication function (optional): The module integrates 2.4GHz Wi-Fi and BLE5.0 communication functions as a wireless communication module (15). The antenna is an on-board PCB antenna by default. In a preferred embodiment, an external antenna can be connected to adapt to different signal environments.

[0162] d. Power Management: The core board integrates an AMS1117-3.3 low-dropout linear regulator with an input voltage range of 4.5V to 5.5V, capable of adapting to voltage fluctuations at the TV's USB port. Actual measurements show that the device in this embodiment consumes approximately 0.4W under full load, meeting the total power consumption requirements for full-load operation. The stringent requirement of 0.5W ensures the feasibility of drawing power from the TV's USB port and its long-term thermal stability in high-temperature environments.

[0163] e. Human-computer interaction: The LED light (3) is integrated on the control circuit board assembly (12) and is used to display the network connection status; the button (4) is integrated on the control circuit board assembly (12) and is used to trigger the network configuration process;

[0164] f. GPIO allocation: GPIO6 pin is used for CEC protocol communication and connected to the CEC interface circuit, GPIO7 pin is used to drive the acoustic feedback module (14), and the remaining GPIO pins are used to drive the LED (3) and the button (4).

[0165] 2. Functional module connection:

[0166] a. Power Connection: The power supply module (6) draws power from the TV's USB port, and after being regulated by the core board's LDO, it powers the entire device. This simplified power supply solution eliminates the need for a separate power adapter, avoiding the risks associated with disassembly due to additional cables.

[0167] b. CEC interface circuit connection (e.g.) Figure 5 The CEC interface circuit consists of a current-limiting resistor (100Ω) and PCB traces. One end of the resistor is electrically connected to a designated GPIO pin (GPIO6) of the control module (13), and the other end is electrically connected to PIN13 of the HDMI socket (5), forming an internal CEC signal path between the control module (13) and the HDMI socket (5).

[0168] c. Composition of the CEC communication link: The CEC communication link is composed of the CEC interface circuit, the HDMI socket (5), the HDMI cable (11), and the HDMI port of the TV. The HDMI socket (5) is connected to the HDMI port of the TV through the HDMI cable (11), thereby forming a complete communication link from the control module (13) to the TV (the wiring of this communication link is referenced). Figure 4 ).

[0169] d. Acoustic feedback connection: GPIO7 of the control module (13) directly drives the acoustic feedback module (14) (active buzzer, sound pressure level). 65dB(A)@1m). The figure shows a pin-type buzzer. It can be understood that, in order to reduce the thickness of the device, a surface-mount (SMD) buzzer or other ultra-thin sound-producing element can be used, and its sound production effect is equivalent to that of this invention.

[0170] e. Heat dissipation optimization: Thermal grease is applied to the back of the control module (13) chip, and thermally conductive silicone pads are attached to conduct heat to the casing for diffusion. Testing showed that in this embodiment, the chip junction temperature remained stable at 55°C during long-term operation. 85 Below C, the thermal compatibility of this utility model was verified.

[0171] This minimalist hardware architecture physically dictates that the device does not include a video encoder, video decoder, video relay circuit, infrared receiver module, or infrared transmitter module, thereby achieving low power consumption, small size, and low cost.

[0172] Hardware structure and signal transmission of CEC communication link

[0173] The CEC communication link described in this invention is a complete hardware communication link, configured to transmit CEC protocol command signals between the control module (13) and the television. The composition and connection relationship of this link are as follows:

[0174] 1. Physical pathway structure:

[0175] a. The link starts at the GPIO6 pin of the control module (13).

[0176] b. Via the CEC interface circuit (including a 100Ω current-limiting resistor and PCB traces).

[0177] c. via PIN13 (i.e. CEC protocol pin) of the HDMI socket (5).

[0178] d. The path is extended into the TV by connecting the HDMI cable (11) to the HDMI port of the TV, thereby forming a complete communication link.

[0179] 2. Level compatibility guarantee: The GPIO port of the control module (13) outputs a 3.3V CMOS level, which is compatible with the 3.3V electrical standard required by the HDMICEC protocol pin, so that the direct connection scheme can be established at the hardware level.

[0180] 3. Electrostatic discharge protection: The electrostatic discharge protection capability of the link depends on the I / O port ESD protection structure (level HBM2kV) integrated inside the control module (13) to meet the reliability requirements of the user scenario.

[0181] 4. Functional Exclusivity: The TMDS video data channel of the CEC communication link is either unwired or disconnected. This hardware design trade-off physically determines the functional boundary of the device, namely, it only transmits CEC protocol commands and does not support video signal transmission.

[0182] The control module (13) runs the built-in firmware program, which generates a signal conforming to the CEC protocol standard by controlling the level change of the GPIO6 pin. This signal is transmitted to the television through the aforementioned hardware path, thereby realizing the control function. The scope of protection of this utility model is defined by the aforementioned hardware structure features, and the firmware program is used to drive and control the hardware structure.

[0183] Equivalent substitution and transformation

[0184] 1. Equivalent replacement for installation thickness: The "installation thickness" The "20mm" limit is an optimal range determined based on statistical measurements of the gap between mainstream wall-mounted TVs and the wall, as well as ergonomic constraints for children. It is understood that certain manufacturing tolerances and design margins are permissible in practical applications. If the installation thickness of the device is slightly greater than 20mm (e.g., ...), ... 22mm or (25mm), but it adopts a streamlined sloped shell design, flexible material shell or compressible mounting structure (such as sponge adhesive), so that it can adapt to deformation during installation. If a 20mm gap is used to achieve the same concealment, tamper resistance, and spatial compatibility as the device of this invention, then such a design should be considered an equivalent replacement for the "installation thickness" described in this invention. The key to determining this lies in whether the narrow gap on the back of the television is utilized to achieve the same "difficult to detect and difficult to operate" tamper resistance effect, rather than the mechanical value of the thickness.

[0185] 2. Equivalent replacement of CEC interface circuit:

[0186] a. Minimalist Implementation Scheme (Core Preferred Scheme of the Invention): This scheme aims to achieve CEC communication function with the lowest cost and complexity under the stringent constraints of mounting on the back of the TV.

[0187] i. Direct connection scheme: The GPIO pin of the control module (13) is directly connected to the CEC pin of the HDMI socket (5) through a current-limiting resistor. This scheme is suitable for main control chips whose GPIO level is compatible with the HDMI CEC level standard (such as 3.3V), and has the advantages of fewer components, lower cost and smaller PCB space occupation.

[0188] ii. Level Conversion Scheme: A bidirectional level conversion chip (such as TXS0102) is added between the GPIO of the control module (13) and the CEC pin of the HDMI socket (5). This scheme is used to adapt to processors whose GPIO output level is incompatible with the CEC standard (such as 1.8V or 5V), and expands the selection range of main control chips while slightly increasing cost and complexity.

[0189] b. High compatibility implementation scheme (equivalent alternative to this invention): This scheme provides stronger signal driving capability and protocol compatibility while allowing for a certain increase in cost and complexity.

[0190] i. Integrated Solution: A dedicated CEC protocol processing chip (such as CH7322B) is used. This chip connects to the control module (13) via an interface such as I²C or UART and independently processes the CEC protocol stack. It can be understood that this solution reduces the protocol processing burden of the main processor by introducing a dedicated chip and may provide better electrical characteristics and compatibility, but at the cost of increased material costs, board area, and overall power consumption. Therefore, it has a certain trade-off with the preferred goals of simplicity, low power consumption, and small size pursued by this invention, but it is still an equivalent alternative implementation under the concept of this invention.

[0191] 3. Equivalent replacement for the control module (13): It can be replaced with any embedded processor that meets the requirements of "no external DRAM and no support for video encoding and decoding". The on-chip SRAM capacity of the processor can be selected according to functional requirements:

[0192] a. For applications that (preferably) require the operation of wireless communication protocol stacks (such as Wi-Fi / Bluetooth), it is advisable to select a processor with an SRAM capacity of not less than 300KB, such as ESP32-C3, ESP32-S2, nRF52840, etc.

[0193] b. For offline applications that do not require wireless connectivity and have simplified functions, processors with SRAM capacity of not less than 100KB can be selected, such as STM32G4 series, STM32L4+ series, GD32E5 series or ATSAME51 series, to ensure system stability and functional expansion.

[0194] 4. Equivalent replacement for HDMI socket (5):

[0195] a. The “HDMI socket (5)” described herein is the preferred embodiment, which has the advantage of being easy to manufacture and for users to install themselves. It can be understood that in the “anti-tamper” application scenario involved in this invention, the requirements for interface connection reliability are higher than in ordinary consumer electronics scenarios.

[0196] b. Therefore, any interface unit structure that provides a more reliable physical connection than the standard plug, thereby further preventing the unauthorized removal of the HDMI cable, should be considered an equivalent replacement and enhancement of the “HDMI socket (5)”. Such structures include, but are not limited to:

[0197] i. Permanent connection: The standard socket is omitted, and the core of the HDMI cable (especially the CEC protocol signal line) is directly connected to the device circuit board by soldering, crimping or other methods to form a permanent electrical connection, thus physically preventing disconnection.

[0198] ii. Locking connection: HDMI sockets with mechanical locking, screw locking or glue sealing structure, which can be disassembled with tools.

[0199] c. It should be specifically noted that the aforementioned structural changes to enhance reliability are conventional design choices readily conceived by those skilled in the art when facing the specific technical problem of "anti-tampering," in pursuit of better anti-tampering effects. The technical means (welding, locking) are conventional, and the pursuit of "more reliable anti-pull-out" is a further extension and enhancement of the core "anti-tampering" effect of this invention, rather than an unexpected new effect. Therefore, such design changes do not depart from the core inventive concept of this invention and should fall within the protection scope of this patent.

[0200] 5. Equivalent alternative to "TMDS data channel not wired or line cut":

[0201] a. The phrase "TMDS data channel is not wired or the line is cut" in the claims of this utility model defines the physical structural characteristics of the CEC communication link that prevent it from transmitting video signals.

[0202] b. It is understood that the technical means to achieve the technical effect that the CEC communication link cannot transmit video signals include, but are not limited to:

[0203] i. Physical disconnection scheme: No wiring or physical disconnection of the TMDS channel on the CEC communication link.

[0204] ii. Function Disabling Scheme: The TMDS data channel remains physically connected, but its video transmission function is permanently disabled through hardware configuration or software instructions of the control module (13), making its electrical characteristics equivalent to a physical circuit break.

[0205] c. The core of determining whether the aforementioned alternative solution is an equivalent replacement of this utility model lies in whether the device achieves the technical effect of making its HDMI video signal path unable to transmit video signals in the final use state through the aforementioned technical means, thereby realizing a function that is essentially the same as the "not supporting video transmission" of this patent.

[0206] 6. Equivalent replacement of acoustic feedback module (14): Acoustic feedback module (14) can be replaced by a passive buzzer (requires PWM drive), a miniature speaker (such as 4Ω 0.5W) or a piezoelectric ceramic sound generator;

[0207] It should be noted that all equivalent substitutions and modifications listed in this section are intended to better achieve the core inventive objective of this utility model: "increasing concealment and disassembly difficulty for rear-mounted TVs, and achieving anti-tamper control through sound status monitoring" in the harsh installation environment on the back of the television. Any solution based on the same inventive concept that replaces one or more specific technical features of this utility model with equivalent technical means and achieves the same or similar technical effects should fall within the protection scope of this utility model.

Claims

1. A child-friendly television anti-addiction control device that supports installation on the back of a television, characterized in that, include: A main functional housing (1); a fixing structure disposed on the bottom surface of the main functional housing (1); a control module (13), which is an embedded processor that does not support video encoding and decoding functions and has no external volatile memory; an HDMI socket (5); a power supply module (6); an acoustic feedback module (14); and the mounting thickness of the main functional housing (1) after being installed by the fixing structure. 20mm; The CEC protocol pin of the HDMI socket (5) is electrically connected to the control module (13) through a CEC interface circuit. The HDMI socket (5) is used to connect to the HDMI port of the TV through an HDMI cable (11) to establish a CEC communication link between the control module (13) and the TV; The TMDS data channel of the CEC communication link is not wired or the line is cut off; The power supply module (6) is electrically connected to the control module (13) and supplies power to the device; The acoustic feedback module (14) is electrically connected to the control module (13); The control module (13) is configured to send CEC protocol commands through the CEC communication link to control the TV and drive the acoustic feedback module (14) to emit an acoustic prompt signal.

2. The apparatus as described in claim 1, characterized in that: The CEC interface circuit does not have a dedicated CEC protocol processing chip.

3. The apparatus as described in claim 2, characterized in that: The CEC interface circuit is a current-limiting resistor.

4. The apparatus as claimed in claim 1, characterized in that: The total capacity of the on-chip volatile memory of the control module (13) 1MB.

5. The apparatus as described in claim 4, characterized in that: The total capacity of the on-chip volatile memory of the control module (13) 512KB.

6. The apparatus as claimed in claim 1, characterized in that: The installation thickness of the main functional housing (1) after installation by the fixing structure 15mm.

7. The apparatus as claimed in claim 6, characterized in that: The installation thickness of the main functional housing (1) after installation by the fixing structure 10mm.

8. The apparatus as claimed in claim 1, characterized in that: Total power consumption of the device when operating at full load 0.5W.

9. The apparatus as claimed in claim 1, characterized in that: The sound pressure level of the acoustic cue signal 65dB(A)@1m.

10. The apparatus as claimed in claim 1, characterized in that: The voltage input range of the power supply module (6) is 4.5V to 5.5V, and the maximum operating current is 500mA.

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